A protective helmet with a head-width adjusting device adjustable from the exterior

摘要

A protective helmet is provided with a head-width adjusting device adjustable from the exterior, wherein an adjusting wheel (5) disposed rotatably at the head side of the helmet shell (6) is connected to a toothed wheel (2) via a mechanically connected flexible element (4) for the transmission of the turning moment, wherein the toothed wheel (2) is disposed in a guide seat (1) in active connection with the head support ring (3), in such a way that the open ends of the head support ring (3) of the protective helmet, which are provided with complementary teeth, can be moved towards or away from one another for the head-width adjustment depending on the direction of rotation.